What makes Senoia particularly interesting from an exterior cleaning standpoint is the variety of housing it contains. Near downtown, you have turn-of-the-century Victorians, craftsman-style homes, and historic painted wood and brick facades that have been standing for over a hundred years. Farther out along the country roads, homes sit on larger lots with significant tree canopy overhead — acreage properties where organic debris, shade, and moisture combine to accelerate buildup on all four exterior elevations. And in the subdivisions that grew up around the town over the past two decades, newer vinyl and fiber cement homes are experiencing their first and second rounds of Georgia algae, often starting at the foundation line and working upward.